Nic

vacuum system is not that complicated as long as you separate out what you are doing. Test one thing at a time and progress from there. When you get your vacuum pump test the source vacuum at the vacuum line that goes to the brake booster. Then check each system to see if it is holding vacuum. The color codes represent the systems that i wrote to you earlier. Also just for fun seal off your ERG valve vacuum connection as that may be giving you leaks.

I also wrote on an earlier thread how to get out the center vent vacuum element in about one hour. You are not ready for that yet so when you are just contact me and i can help you out.

good luck

bob